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S' 2 CAMBRIA existing well screen intervals. Additionally, Cambria will collect a deeper sample, at approximately 75 fbg, from borings CPT-2, CPT-3, and CPT-4. A Cambria geologist will supervise the drilling, and encountered soils will be continuously logged using electronic cone penetrometer test (CPT) technology. Soil samples will be retained in brass or stainless-steel sample tubes and covered on both ends with Teflon sheets and plastic end caps. Groundwater samples will be collected with CPT groundwater sampling equipment and transferred into vials containing hydrochloric acid preservative with no head space. Soil and groundwater samples will be labeled, entered onto a chain-of-custody record, and placed into a cooler with ice for transport to a State of California certified laboratory for analyses. Chemical Analyses: Soil and groundwater samples collected from the borings will be analyzed for TPHg, BTEX, fuel oxygenates(MTBE, ethyl tertiary butyl ether, DIPE, tertiary amyl methyl ether, and TBA), and lead scavengers (1,2-dichloroethane and ethylene dibromide) by EPA Method 8260B. Soil and groundwater samples collected from borings CPT-1, CPT-2, and CPT-3 will also be analyzed for PCE and TCE by EPA Method 8260B. Note that the shallow groundwater sample (collected in the 30- to 504bg range) from CPT-2 will only be analyzed for TPHg PCE, and TCE, as the other constituents are delineated by well MW-2. Report Preparation.Following the receipt of analytical results from h laboratory,ry, Cambr awill prepare a written report which will include field procedures, laboratory results, CPT logs, and conclusions. The scope of work described in this work plan will be performed under the supervision of a registered geologist. REVISED GROUNDWATER MONITORING PROGRAM As discussed above, the groundwater analytical results from wells MW-1 and MW-2 indicate that PCE and TCE may be contributing to the TPHg concentrations reported in these wells. - Therefore, Cambria recommends analyzing samples from these wells once for PCE and TCE. We will conduct these additional analyses during the fourth quarter 2004 sampling event. i Additionally, Cambria recommends reducing TPHg and BTEX analyses in wells MW-3 and MW-4 to annual during the second quarter since these constituents have never been detected in these wells. If SJCEHD concurs with this recommendation, Cambria will implement this change beginning with the first quarter 2005 sampling event. 1641 4